I read "Stereo unmasking means that certain coding artifacts which are being masked in single channel coding can become audible when presented as a stereo signal coded by a dual mono coding system".

But I don't understand.

Each channels' artifacts are masked in each single channel. (left, right)

It means that artifacts can't become audible in sigle channel.

However, why can coding artifacts become audiable when presented as a stereo
signal coded?

Please, help me.

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or

Do you know where the information about this is?

I have 3 books. ("Spatial Hearing,Jens Blauert",
"Psychoacoustics,E.Zwicker",
"Foundation of Mordern Auditory Theory,Tobias")

Try reading some articles online about "Binaural hearing". This is a neurological effect.. something to do with the human brain.. not the human ear..

You might find parts of this interesting, but it's a big download:

http://www.mp3-tech.org/programmer/docs/index.html
Grab "Perceptual Model for Assessment of Coded Audio - D Robinson - 20376K" if you can.

Cheers,
David.

As i understand it our ear-brain can unmask sounds based on their perceived spatial location. This is partly how we can focus on one voice in a crowd of people.

In a stereo MP3 for example a sound that is in both channels will be spatially located in the centre of the stereo image, whereas the artifacts for each channel may be located in the left or the right channel, but not in the centre. This gives spatial seperation and the possiblity of unmasking.

-Iain

Thank you!! Thank you!!Thank you!!Thank you!!Thank you!!Thank you!!

^^;;

I studied about binaural masking.